TRC101 300-1000 MHz Transceiver - RF Monolithics, Inc.

Transmit Configuration Register [POR=9800h]Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 01 0 0 1 1 0 0 MODP DEV3 DEV2 DEV1 DEV0 0 PWR2 PWR1 PWR0The Transmit Configuration Register configures:• Modulation Polarity• Modulation Bandwidth• Output Transmit PowerBit [15..9] - Command Code: These bits are the command code that is sent serially to the processor thatidentifies the bits to be written to the Transmit Configuration Register.Bit [8] – Modulation Polarity: When clear, a logic ‘0’ is defined as the lower channel frequency and alogic ‘1’ as the higher channel frequency (positive deviation). When set, a logic ‘0’ is defined as thehigher channel frequency and a logic ‘1’ as the lower channel frequency (negative deviation).Bit [7..4] – Modulation Bandwidth: These bits set the FSK frequency deviation for transmitting a logic ‘1’and logic ‘0’. The deviation is programmable from 15kHz to 240kHz in 15kHz steps. See Table 7 belowfor deviation settings.TABLE 7.Modulation Bandwidth Hex DEV3 DEV2 DEV1 DEV015 kHz 0 0 0 0 030 kHz 1 0 0 0 145 kHz 2 0 0 1 060 kHz 3 0 0 1 175 kHz 4 0 1 0 090 kHz 5 0 1 0 1105 kHz 6 0 1 1 0120 kHz 7 0 1 1 1135 kHz 8 1 0 0 0150 kHz 9 1 0 0 1165 kHz A 1 0 1 0180 kHz B 1 0 1 1195 kHz C 1 1 0 0210 kHz D 1 1 0 1225 kHz E 1 1 1 0240 kHz F 1 1 1 1Bit [3] – Not used. Write as logic ‘0’.Bit [2..0] – Output Transmit Power: These bits set the transmit output power. The output power isprogrammable from Max to -21dB in -3dB steps. See Table 8 below for Output Power settings.TABLE 8.Output Power (Relative) PWR2 PWR1 PWR0Max 0 0 0-3dB 0 0 1-6dB 0 1 0-9dB 0 1 1-12dB 1 0 0-15dB 1 0 1-18dB 1 1 0-21dB 1 1 1www.RFM.com Email: info@rfm.com Page 19 of 42©by RF Monolithics, Inc. TRC101 - 4/8/08